Remove old wrapper script.
Fix bug that prevented spawning indexers.

This patch fixes a bug that prevented spawning of indexers when we're appending
to an existing partition and the schema hasn't changed since the last import.
Do not fail on absent intermediate records.
Misc. tweaks.
Equip VAST with time machine functionality.

VAST can now both read and write PCAP traces using libpcap. A PCAP source reads
packets from a trace and extracts some basic packet meta data from network and
transport layer. Link layer information is stripped entirely. A PCAP sink
writes packet events back to PCAP format.

For this to be useful in practice, we need three additional features:

  (1) The ability to selectively index events. Right now VAST indexes every
      event value, including the packet contents.

  (2) A per-flow cut-off value to control the size of the packets.

  (3) A sequential query mode that retrieves events in the same order they have
      entered the system. Otherwise we'd need to buffer and sort events when
      they arrive as results.